LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 10) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			$ 264,959
Ending balance	$ 255,812		255,812
Allowance for Unfunded Credit Reserve
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	20,318	$ 19,741	20,360	$ 12,712
(Reversal of) provision for unfunded credit reserves	(1,989)	(698)	(2,031)	6,331
Ending balance	18,329	19,043	18,329	19,043
CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			81,538
Ending balance	71,977		71,977
C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			134,606
Ending balance	143,447		143,447
Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			39,295
Ending balance	32,500		32,500
Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			9,520
Ending balance	7,888		7,888
PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			359
Ending balance	156		156
PCI Loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			347
Ending balance	148		148
PCI Loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			9
Ending balance	3		3
PCI Loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			3
Ending balance	5		5
PCI Loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			0
Ending balance	0		0
Loans Receivable
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	266,768	261,229	264,959	261,679
(Reversal of) provision for loan losses	11,514	8,434	19,049	9,886
Charge-offs	(24,047)	(7,480)	(32,457)	(19,473)
Recoveries	1,577	2,247	4,261	12,338
Net recoveries (charge-offs)	(22,470)	(5,233)	(28,196)	(7,135)
Ending balance	255,812	264,430	255,812	264,430
Loans Receivable | PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	257	612	359	714
(Reversal of) provision for loan losses	(101)	(71)	(203)	(173)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net recoveries (charge-offs)	0	0	0	0
Ending balance	156	541	156	541
Loans Receivable | Non-PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	266,511	260,617	264,600	260,965
(Reversal of) provision for loan losses	11,615	8,505	19,252	10,059
Charge-offs	(24,047)	(7,480)	(32,457)	(19,473)
Recoveries	1,577	2,247	4,261	12,338
Net recoveries (charge-offs)	(22,470)	(5,233)	(28,196)	(7,135)
Ending balance	255,656	263,889	255,656	263,889
Loans Receivable | Non-PCI Loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	78,102	75,496	81,191	72,263
(Reversal of) provision for loan losses	(6,598)	2,333	(9,731)	5,739
Charge-offs	(309)	(135)	(504)	(1,486)
Recoveries	634	83	873	1,261
Net recoveries (charge-offs)	325	(52)	369	(225)
Ending balance	71,829	77,777	71,829	77,777
Loans Receivable | Non-PCI Loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	148,427	133,962	134,597	134,598
(Reversal of) provision for loan losses	18,548	11,221	38,549	13,883
Charge-offs	(23,696)	(7,187)	(31,770)	(16,619)
Recoveries	165	933	2,068	7,067
Net recoveries (charge-offs)	(23,531)	(6,254)	(29,702)	(9,552)
Ending balance	143,444	138,929	143,444	138,929
Loans Receivable | Non-PCI Loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	31,561	40,668	39,292	43,856
(Reversal of) provision for loan losses	309	(4,979)	(7,679)	(9,868)
Charge-offs	(29)	(35)	(166)	(782)
Recoveries	654	1,158	1,048	3,606
Net recoveries (charge-offs)	625	1,123	882	2,824
Ending balance	32,495	36,812	32,495	36,812
Loans Receivable | Non-PCI Loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	8,421	10,491	9,520	10,248
(Reversal of) provision for loan losses	(644)	(70)	(1,887)	305
Charge-offs	(13)	(123)	(17)	(586)
Recoveries	124	73	272	404
Net recoveries (charge-offs)	111	(50)	255	(182)
Ending balance	$ 7,888	$ 10,371	$ 7,888	$ 10,371